GATE CE kind:question PYQs & Answers — Page 20

Questions 191–200 of 1300. Imported answers require independent review unless marked reviewed.

Topic practice 1300 questionsPage 20 of 130

The Surface Overflow Rate (SOR) in a rectangular sedimentation tank is 45 m³/m²/d. Minimum diameters of spherical inorganic and organic particles expected to be completely removed in this tank are calculated. Assume that Stoke’s law is applicable. Which of the following options is/are correct:

Specific gravity of inorganic particles = 2.65

Specific gravity of organic particles = 1.20

Acceleration due to gravity (g) = 9.81 m/s²

Kinematic viscosity (ν) = 1×10⁻⁶ m²/s

Your answerSelect all correct options. You can choose more than one.

Minimum diameter of inorganic particles is 24 μm

Minimum diameter of organic particles is 69 μm

Minimum diameter of inorganic particles is 15 μm

Minimum diameter of organic particles is 55 μm

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From a flow-net diagram drawn under a concrete dam, following information are obtained: (i) The head difference between upstream and downstream side of the dam is 9 m. (ii) The total number of equipotential drops between upstream and downstream side of the dam is 10. (iii) The length of the field nearest to the toe of the dam in the downstream side is 1 m.

If the soil below the dam is having a saturated unit weight of 21 kN/m

and unit weight of water is 9.81 kN/m

, then the factor of safety against the quick condition will be _____ (round off to two decimal places).

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Aeration is employed as a treatment option for the removal of several pollutants from contaminated water.

Identify the pollutant(s), where aeration is employed as a part of their removal:

Your answerSelect all correct options. You can choose more than one.

Iron

Cadmium

Manganese

Zinc

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A 6 m thick clay stratum has drainage at both its top and bottom surface due to the presence of sand strata. The time to complete 50% consolidation is 2 years. The coefficient of volume change (m

) is 1.51×10

/kN and unit weight of water is 9.81 kN/m

The coefficient of permeability (in m/year) is _____ (round off to three decimal places).

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If the weights retained on the 2.36 mm, 1.18 mm, 600

m, and 300

m sieves are 30%, 5%, 15%, and 20%, respectively, of the total weight of an aggregate sample, then the fineness modulus of the sample is __________ (rounded off to 2 decimal places).

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Consider steady flow of water in the series pipe system shown below, with specified discharge. The diameters of Pipes A and B are 2 m and 1 m, respectively. The lengths of pipes A and B are 100 m and 200 m, respectively. Assume the Darcy-Weisbach friction coefficient, f as 0.01 for both the pipes.

The ratio of head loss in Pipe-B to the head loss in Pipe-A is _____ (round off to the nearest integer).

Diagram for Civil Engineering question 33

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A water resources project with an expected life of 25 years has to be designed for an acceptable risk of 5% against a design flood. The return period for the design flood (in years) is __________ (rounded off to the nearest integer).

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Free residual chlorine concentration in water was measured to be 2 mg/l (as Cl

). The pH of water is 8.5. By using the chemical equation given below, the HOCl concentration (in

moles/l) in water is ______________ (round off to one decimal place).

HOCl ⇌ H

+ OCl

, pK = 7.50

Atomic weight: Cl (35.5)

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Road A and Road B are joined by a circular horizontal curve of radius 200 m as shown in the figure. Road A and Road B are tangent to the curve at the points C and D, respectively. Had the curve not been there, straight roads A and B would have met at the point E. The distance from C to E is 92 m. The value of angle

(in degrees) is __________ (rounded off to 1 decimal place).

Note: The value of angle

is to be calculated only from the consideration of Euclidean geometry and the data given in the problem.

Diagram for Civil Engineering question 35

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A surveyor measured the distance between two points on the plan drawn to a scale of 1 cm = 40 m and the result was 468 m. Later, it was discovered that the scale used was 1 cm = 20 m.

The true distance between the points (in m) is _____ (round off to the nearest integer).

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GATE CE kind:question PYQs

Question 31

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Question 33

Question 33

Question 34

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Question 35

Question 35